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What is the meaning of standardized mortality ratio?
The standardized mortality rate (SMR) is the ratio of the number of deaths observed in a population over a given period to the number that would be expected over the same period if the study population had the same age-specific rates as the standard population.
What does an standardized mortality ratio of 1.0 mean?
SMR = 1.0 indicates the number of observed deaths equals the number of expected deaths in the study population. SMR >1.0 indicates there were more than expected deaths in the study population (excess deaths)
What is SMR in epidemiology?
1. Definition: STANDARDIZED MORTALITY RATIO (abbreviated SMR) is the number of observed deaths in the study population divided by the number of expected deaths (calculated from indirect adjustment) and multiplied by 100 (Lilienfeld & Stolley, 1994; Last, 2001).
Why do we standardize mortality rates?
Standardized Mortality Ratios are frequently used in epidemiology to compare different study groups, because they are easy to calculate and also because they provide an estimate of the relative risk between the standard population and the population under study.
What does age standardised mortality rate mean?
The age-standardized mortality rate is a weighted average of the age-specific mortality rates per 100 000 persons, where the weights are the proportions of persons in the corresponding age groups of the WHO standard population.
How do you interpret mortality rate?
Mortality rate is typically expressed in units of deaths per 1,000 individuals per year; thus, a mortality rate of 9.5 (out of 1,000) in a population of 1,000 would mean 9.5 deaths per year in that entire population, or 0.95% out of the total.
Why is it useful to Standardise mortality rates by age?
Age-standardised mortality rates (ASMRs) are used to allow for comparisons to be made between populations that may contain different overall population sizes and proportions of people of different ages.
Is a higher mortality rate better?
Based on data from the Global Burden of Disease Study, the HAQ Index is scaled from 0 to 100: lower scores indicate high mortality rates for these causes, while higher scores indicate lower mortality rates and thus better quality of and access to health care.
What does a higher mortality rate mean?
the relative frequency of deaths in a specific population during a specified time, often cited as the percentage of human deaths during a public health crisis, or of wildlife deaths due to environmental perils: Patients over the age of 80 had the highest mortality rate during the last flu season.
What does age Standardised mortality rate mean?
Is a high mortality rate good?
What does age-standardized mortality mean?
Age-standardized mortality rate (ASMR): A weighted average (based on a standard population) of the number of deaths from cancer per 100,000 people in a 5-year age group (0 to 4, 5 to 9, …, 85 and older) that occurred during a year divided by the number of people in that age group that year.
Is a lower mortality rate good or bad?
Is a higher mortality rate good or bad?
Is a lower mortality rate better?
According to the latter, lower mortality precedes and drives lower fertility, because fewer children are required to maintain the population equilibrium and cultural ideologies evolve to maintain population equilibrium.